Fuel-saving attachment for furnaces.



N. J. RUSSELL & C. A. TYDEN.

FUEL SAVING ATTACHMENT FOR FURNACES.

APPLICATION FILED JUNE 28, 1915.

1,167,845. Patented Jan. 11, 1916.

2 SHEETS-SHEET I.

HAUL .6621. ZQQQW N. J. RUSSELL & C. A. TYDEN.

FUEL SAVING ATTACHMENT FOR FURNACES.

APPLICATION FILED JUNE 28,1915.

Patented Jan.'1l, 1916.

2 SHEETS-SHEET 2 WWW HHITI I u I CQLUMBIA PLANOGRAPH COnWASHINGTON, D. C.

fuel, ,as well as, prevent ng the passlng ofi, 1n the form of sur $AEEST ATE nELsoiv J. nussntn nn cant A. TYDEN, or onrcneo, LrNoIs.

FUEL-SAVING ATTACHMENT FURNACES.

Specification of Letters Patent.

Patented Jan. i was.

Application filed June 28, 1915. Serial No. 36,649.

To all whom it may concern:

Be it known that we, NELSON J. RUSSELL and CARL A. TYDnN, citizens of the United States, residing at Chicago, in the county of ,Cook and State of Illinois, have invented new and useful Improvements in Fuel-Saving Attachments for Furnaces, of which the following is a specification.

This invention relates to improvements in an attachment to be applied to furnaces in general, but more particularly to the furnaces of high pressure boilers, and to the furnaces of power and heating plants, and it consists in certain peculiarities of the construction, novel arrangement and operation of the parts thereof, as will be herein more fully set forth and specifically claimed.

The main object of the invention is to provide simple and efficient means to be applied to furnaces, the term furnaces being used in a broad enough sense to include stoves, ranges, bake-ovens, boiler furnaces. kilns, and the like, for the purpose of supplying atmospheric air and pre-heating the same as it is supplied to the interior of the furnaces, to the end, that the supply of air may be heated to a relatively high degree of temperature before being admitted to and distributed or discharged within the furnace, and so that its heated oxygen will be utilized to increase from a given amount 01 fuel, the combustion of the combustible gases, or of the free carbon released during the burning of such gases, thus attaining the maximum amount of heat units from the reducing to a minimum, or

smoke, unconsumed particles of carbon, or unburnt gases. 'In other words, the present invention has for its principal obyect, the

same as that set forth in the application of Nelson J. Russell filed March 12, 1915, Serial Number 14,018 for fuel saving attach- Inent forf na e 7 Another object of the invention, is to provide an attachment or apparatus of the above described general character, which shall be o such construction, that it can be placed in operative position within the furnace, and -mainly, within the combustion chamber thereof, so as to occupybut little space so that the parts of the attachment i l h out o th Way f tok ng o ed ng fuel to the combustion chamber of the furnac V e St l an the o jec is 99 s .see truet the of the invention will be disclosed in the sub joined description and explanation.

In the accompanying drawings which serve to illustrate an embodiment of the inventionFigure 1 is a front view of a portion of a furnace showing the face plate or front wall thereof broken away to illustrate the position occupied by our fuel saving attachment. Fig.2 is an enlarged plan sectional view of the attachment showing it detached from thefurnace. Fig. 3 is an enlarged vertical sectional View taken on line 3-3 of Fig. 1, looking in the direction indicated by the arrows showing a portion of the front wall of the furnace, and a part of the intake portion of the attachment, illustrating the means of connecting the attachment at its intake end to the furnace. Fig. 4c is an enlarged cross-sectional view taken on line 44: of Fig. 1 and the same line of Fig. 2, looking in the direction indicated by the arrows. Fig. 5 is a vertical sectional view taken on line 5-5 of Fig. 1, looking in the direction indicated by the arrows and Fig. 6 is a cross-sectional view taken on line 6--6 of Fig. 2.

Like numerals of reference, refer to corresponding parts throughout the difierent views of the drawings.

The reference numeral 10 designates the outer or side walls of a furnace which may be of the ordinary or any preferred construction, which as usual, has a combustion chamber or fire-box 11 and an ash-pit 12 be tween which is located a grate 13 of the ordinary or any well'known construction. The face or front wall of the furnace, is indicated by the numeral 14 and has therein door-ways leading to the fire-boX 11 and ashlosed by means of 1 pit 12 which ways are doors 15 and 16 respectively. Horizontally located in the upper portion of the fire-box 11 and ordinarily directly under a portion of the boiler' 17 's two-way casing or shell, that is ,to say, a casg the main airheatingpon tion of our attachment, which consists of a 2 of the drawings, in which figure it will be observed that the conduits 19 and 20 are divided by a partition 21 which forms one side of the inlet conduit, and which partition extends continuously between the walls of the manifolds or members 22 of the casing but terminates short of the manifold or member opposite the intake end of the casing. Horizontally connected to the easing 18 near its intake end and extended at a right angle therefrom and horizontally along-side the inner surface of the front wall it of the furnace is an expansion and discharge chamber or conduit 23, which by reference to Fig. seen, communicates with the discharging end of the return conduit 20 of the casing. It will also be observed by reference to said figure, that the communicating passage between the discharging end of the conduit 20 and the expansion and discharging chamber or conduit 23, is contracted by means of an internal enlargement 24: formed on one of the walls of the conduit 20. The expansion chamber or conduit 23 is provided in its lower surface with a longitudinal slot 25 through which the pre-heated air will be discharged downwardly into the combustion chamber and at the front wall thereof. At its end opposite that end which is connected to the inlet portion of the casing 18, the chamber or conduit 23 is provided in its lower portion with an opening 26 through which heated air will pass through a 0011- duit 27 into a horizontally disposed expansion chamber or discharging conduit 28 located at the front portion of the grate 13 or front portion of the ash-pit 12, into which pit air will be discharged through a slot 25 formed in the bottom of the last named expansion chamber or discharging conduit.-

The pipe or conduit 27 which connects the expansion. chambers 23 and 28 has at each of its ends an apertured flange 29 through which apertures bolts engaging the adjacent surfaces of the expansion chambers 23 and 28 are extended, thus firmly uniting said chambers.

As shown in Figs. 2, 3 and 5 of the drawings, the inlet end of the conduit 19 is provided with an external flange 30 to which is bolted a flange-31 on the inner end of an inlet tube or member 32 which member has its outer end externally screw-threaded, and is provided near the flange 31 with another flange 33 to rest against the inner surface of the front wall 14 of the furnace, which wall may have a dead air space 34 as is clearly shown in Fig. 3 of the drawing. The inlet tube or member 32 is extended through a suitable opening 35 in the front wall of the furnace and has mounted on its screwthreaded end a flanged nut 36 which will securely hold said member in position and thereby support the front part of the at- 2 of the drawing, it will be tachment at a suitable point near the top of the fire-box or combustion chamber, by preference, above and to one side of the door-way leading to said chamber. It is obvious however, that the intake member 32 could be extended through a suitable opening in the side walls of the furnace and the parts of the attachment located within the furnace could be correspondingly arranged without departing from the spirit of our invention.

As it is preferable, for the sake of convenience in applying our attachment to furnaces, through the door-way of the fire-box, and as some door-ways may not be large enough to admit of the insertion of the com pieted attachment, or upper portion thereof, we may make the casing 18 in two sections, one of which sections is indicated by the reference numeral 37 and the other by the reference numeral 38, (see Fig. 2 of the drawings). The adjacent ends of these sections are provided with external and apertured flanges 39 which after the section 37 has been inserted through the doorway of the furnace and mounted in thedesired position, and after section 38 has been inserted through sair door-way, said flanges canbe secured together by means of bolts 40 as is obvious.

As will be understood by reference to Fig. 2, the casing of the attachment comprises a series of communicating members 22 which are joined at their ends by means of bends, and that said members 22 are spaced from ach other, except at their junctures, thus permitting the heat and flames from the fire-box to pass between and surround said members, so that the air passing through the conduits of said members will be quickly and highly heated. The expansion chamber 23, conduit or pipe 27 and expansion or discharge chamber 28 being in communication with the conduits 20 and19 will afford means for the continuous circulation of air from the inlet end of the casing of the apparatus to and through the discharging chamber or conduit 28, should such continuous circulation be desired, but by preference the horizontally disposed conduit 23 is provided with a slot 25 in its lower portion, so that a part of the preheated air may be discharged into the fire-box, and the remainder through the discharge conduit 28 into the ash-pit or below the grate of the pit.

The members 22 of the casing or appara-' tus may be connected together by means of lugs or connections 41 with which the sides of said members may be provided. 7

The advantages of preheating and fur nishing heated air to a furnace and discharging or dispersing the same into it, is so well known as to require no further comment here, but by means of our apparatus, we are enabled not only to discharge preheated air into the fire-box, but also into the ash-pit from whence it will rise through the grate and the burning fuel thereon, and create more perfect combustion, thereby effecting a great saving in the amount of fuel consumed, as well as, in obviating to a large extent the formation and discharge of smoke, which consists largely of unconsumed particles of carbon.

The area or capacity of the chambers 23 and 28, are by preference in excess to the cross-sectional area of the return conduit 19 as well as the conduit 27, so as to afford expansion chambers or conduits from which the heated air will be drawn or will be caused to be discharged by the draft through the furnace, which draft may be regulated in any well known way.

Having thus fully described our invention what we claim as new and desire to secure by Letters Patent is- 1. In a fuel saving attachment for furnaces, the combination with a furnace having an opening therein leading to the combustion chamber thereof, of a casing horizontally located in the upper portion of said chamber and having communication with said opening, said casing comprising a plurality of spaced apart members united at their alternate ends and each provided with a plurality of conduits, one of said conduits only having communication with the said opening in the furnace, and an expansion and discharge chamber or conduit located within the furnace and communicating with the discharging end of another one of said conduits of the casing.

2. In a fuel saving attachment for furnaces, the combination with a furnace having an opening therein leading to the combustion chamber thereof, of a casing horizontally located in the upper portion of said chamber and having communication with said opening, said casing comprising a plurality of spaced apart members united at Copies of this patent may be obtained for five cents each, by addressing the their alternate ends and each member pro vided with a pair of conduits, one of said conduits only having communication with said opening in the furnace and adapted for the forward circulation of air, and the other conduit having communication with the first named conduit at its terminus and adapted for the rearward or return circulation of air, and an expansion and discharge chamber-casing having communication with the discharging end of the said return conduit and located horizontally within the furnace, said expansion and discharge chambercasing having an opening for the discharge of air.

3. In a fuel saving attachment for furnaces, the combination with a furnace having an opening therein leading to the combustion chamber thereof, of a casing horizontally located in the upper portion of said chamber and having communication with said opening, said casing comprising a plurality of spaced apart members united at their alternate ends and each provided with a pair of conduits co-extensivewith said mem bers and easing, one of said conduits only having communication with the said open ing in the furnace, an expansion and discharge chamber-casing or conduit horizontally located within the combustion chamber and communicating at one of its ends with the discharging end of one of said conduits of the casing, a conduit extended downwardly from the free end of said chamber casing, and a horizontally disposed expansion and discharge chamber-casing located at the front portion of the ash-pit of the furnace and having means for the discharge of air into said pit.

NELSON J. RUSSELL. GAR-L A. TYDEN.

l/Vitnesses:

CHAS. C. TILLMAN, A. E. OLSON.

Commissioner of Patents,

Washington, D. G. 

